Trivia: George reads a paperback while reclining on his prison bunk. The book is "Hells Angels" by Hunter S. Thompson, the author whom Depp previously portrayed in the movie Fear and Loathing in Las Vegas (1998).
Trivia: James Toney, Michael Bentt, Alfred Cole, Charles Shufford and Damien 'Bolo' Wills who all play opponents of Ali are - or were - real life boxers.
Trivia: Another indicator that the people weren't real: The little girl runs among some pigeons on the ground and none of the pigeons fly off.
Trivia: The nurse who brings Bev her baby in the hospital is played by Tracy Reiner, director Penny Marshall's daughter.
Trivia: In case you missed it, this film was based on a true story.